Intersection Equipment Installation Instructions
67
Recommendations
• Use a 1N4004 or equivalent diode.
• Use a 24 VDC relay with a coil impedance of approximately 1000 ohms. The maximum amount of
current that the phase selector output is designed for is 50 mA.
The following relay manufactured by IDEC meets the above listed requirements:
• Relay: RH1B-UD-DC24V
• Socket: SH1B-05
• This relay contains a diode, so the diode shown in Figure C-1 is not needed.
• This relay is available from Newark Electronics and other electronics supply houses.
NOTE: For applications with frequent activations, it is recommended that a solid-state relay be used in
place of an electro-mechanical relay. A load switch would be another option.
• Omron G3NA-205B-DC5-24
o This relay is available from Digikey www.digikey.com, (p/n Z165-ND) and other electronics
supply houses.
The following table lists the wire colors for Channels A through D and Logic Ground when using a card
rack. See Figure B-1.
Channel X Output Wire Color
Channel A Gray/White
Channel B Blue/White
Channel C Violet/White
Channel D Brown/White
Logic Ground Gray/Black
Table B-1
For more pin-out information, refer to the Phase Selector Pin Index tables in this manual.
When using a 760 card rack, phase selector 24 VDC power may be used provided the total load between
relays and detectors is less than 300mA. Model 711 detectors consume 15 mA and Model 721 and 722
detectors consume 30 mA.
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